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Why do I need web api to link between django and other js framworks

why do i need a web API to link between django and other JS frameworks for example django with angular?
And is it necessary to build a web API like (REST API) to link between back end and front end?

Django is not JS library. It's a Python-based server framework. But your JS library communicates with a server via REST Api. So you need a web API to link between django and other JS frameworks.

Without more work than it is worth, the DJango and Angular frameworks probably cannot pass data between one and the other, since both run at the same logical level in the stack.
REST APIs are the generally accepted mechanism for communicating between SPAs implemented in different frameworks.

Using django web app backend with mobile app on ReactJS

I have backend of web app by django, include registrations/user profile,
the ability to add photo(video) file and view them, and list of places with the ability to book them.
Now I need to add the ability to work with a mobile application written in ReactJS.
The problem is that before that I did not work with mobile applications and I do not know what strategy to choose, but the frontend developer did not work with the backend. Can I pass django variables directly to the ReactJS code? Do I need additional technologies or frameworks? I would be grateful if someone shared their experience and described how to do it (preferably the least simple way)

You have to build a REST API. In your case, the best solution would be creating the API with Django REST Framework.
It is a very powerful framework for building APIs. They provide some nice tutorials to get started with it.
After that, you can create the frontend app with React by using API calls.

How to create a Python API and use it with React Native?

I'm learning about basic back-end and server mechanics and how to connect it with the front end of an app. More specifically, I want to create a React Native app and connect it to a database using Python(simply because Python is easy to write and fast). From my research I've determined I'll need to make an API that communicates via HTTP with the server, then use the API with React Native. I'm still confused as to how the API works and how I can integrate it into my React Native front-end, or any front-end that's not Python-based for that matter.

I think you have to follow some online tutorial
And from my experiences, I think Flask is good choice for such case.
This is basic flask tutorial provided by tutorialspoint.com

You have to create a flask proxy, generate JSON endpoints then use fetch or axios to display this data in your react native app. You also have to be more specific next time.

Consume web service with DJANGO

I have a django application to show some data from my database (ORACLE), but now I need to show some data from a web service.
I need to build a form based in the request of the web service, and show the response of the web service.
I googling to expose my app as a web service and send and retrieve XML data.
But I am very confused and I don't know where to start or which django package to use(PyXML,DJANGO REST).
I am not sure if I need to build a web API or I can consume the web service without the web api.
Can someone give some advices to achieve this task.

You don't need to build a web API if all you want to do is consume someone else's API. Just retrieve the data - with something like requests - and use it in your Django app.

Any python web framework with the following features?

As the basic framework core:
Request Lifecycle REST
Routing
Requests & Input
Views & Responses
Controllers
Errors & Logging
And these features would make our dev easy and fast:
Authentication
Cache
Core Extension
Events
Facades
Forms & HTML
IoC Container
Mail
Pagination
Queues
Security
Session
SSH
Templates
Unit Testing
Validation
And really good support for MongoDB.
Is there any such framework?

There is a fork of Django that supports non relational databases. For my own projects I prefer to use a hybrid: standard (relational) Django, with MongoEngine for entities I want to store in MongoDB. The syntax is almost identical to django.db models.

I'm kinda confused by the desire of a "REST lifecycle" combined with features like "Session", "Input", etc.
For a general purpose Web/API application you might want to check out on Flask and Flask-PyMongo. Could be a good match for your use case.
If you're looking into building a RESTful Web Service, then the Eve REST API framework (which is powered by Flask and supports MongoDB out of the box) could be a good choice. You can then peek into the source of extensions like Eve-Docs to learn how to, eventually, integrate the webservice with HTML/static/dynamic pages (Flask style.)

Try Django.. im not sure but worth trying